Moxa Technologies Moxa Smartio C168H Manuel d'utilisateur télécharger pdf (Page 57)

Serial Programming Tools

Smartio C168H/PCI User’s Manual 4-7

sio_SetWriteTimeouts(port, 0); /* Set sio_write() into block mode */

sio_RTS(port, 1); /* Turn on RTS signal. The RS-485 port is

ready for

transmitting data. */

sio_write(port, buff, 10); /* Write 10 byte characters in "buff". The

function

blocks until last character transmitted */

sio_RTS(port, 0); /* Turn off RTS signal. The RS-485 port is

ready for receiving data. */

sio_read(port, buff, 10); /* Read 10 bytes */

Solution 2

The PComm library contains a dedicated RS-485 function that integrates the functions

given in solution 1 regarding sending data.

sio_putb_x(port, buff, tick ); /* 1. Turn on RTS ; ready for transmitting data

2. Send data.

3. Wait for tick time.

4. Turn off RTS ; ready for receiving data. */

For more information about these functions, refer to the PComm library on-line Help

file for Windows NT and Windows 95/98.

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Moxa Technologies Moxa Smartio C168H Manuel d'utilisateur Page 57